I still have trouble believing that anything is going to happen, we've gone through this with every Olympics where there's a fear of a bombing or shooting and with the exception of Atlanta I think we've been clean.
Basically though the terrorists have already won. Sochi is locked down there are going to be heavily armed guards all over the place and long line ups at the venue's to get in due to heightened security.
The athletes are going to be completely separated from the people unlike Vancouver where you saw Athletes walking down the street drinking beer.
On a positive note as repressive as Russia is, their internal security operations are extremely competent and their intelligence gathering is top notch, Russia is also very heavy handed in its shows of force when need be.
I doubt anything is going to happen, but the effect is an upping in the pain in the a## level
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